code: def test_given_missing_pwd_file_expect_app_fails(self):
      self._set_file(
          self.config_file.name, "[TabPy]\n" "TABPY_PWD_FILE = foo"
      )
  
      with self.assertRaises(RuntimeError) as cm:
          TabPyApp(self.config_file.name)
          ex = cm.exception
          self.assertEqual(
              f"Failed to read password file {self.pwd_file.name}",
              ex.args[0],
          )
  
file_path: TabPy/tests/unit/server_tests/test_pwd_file.py
imports: import os
  import unittest
  from tempfile import NamedTemporaryFile
  from tabpy.tabpy_server.app.app import TabPyApp
label_desc: Use image node_id 6 for calling the TestPasswordFile obj's underlying member method code with example usage: obj.test_given_missing_pwd_file_expect_app_fails() without return types